COOPERATIVE FREIGHT CAR TRUCK AND SNUBBER RESEARCH PROGRAM

This item consists of the conclusions and four appended reports to MR114. It was found that in trucks with all-coil springs without snubbers, the best performance was obtained with 1 5/8" spring travel. All snubbing devices tested provided definite improvement in riding quality over that provided by unsnubbed springs. None of the fifteen Unit Snubbers tested provides performance considered satisfactory to a speed of 65 mph. Five of the eleven Package Snubbers tested provide performance considered satisfactory ("fair") to a speed of 90 mph. Two of the three Modified Conventional Trucks tested provide performance considered satisfactory ("fair") to a speed of 90 mph. These two trucks are as follows: HOLLAND RS-8 with 2 1/2" springs and HOLLAND RS-8 with CESD springs. Twenty-eight of the thirty-five High-Speed Trucks tested provided performance considered satisfactory to a speed of 90 mph. The appendices includes reports of studies on the performance of solid-type journal bearings, roller bearing research, lateral action of freight car trucks and accelerometer performance and side frame stress.

• Supplemental Notes:
  • First 12 pages of report missing.
• Corporate Authors:

  Association of American Railroads

  50 F Street, NW
  Washington, DC  United States  20001-1564
• Publication Date: 1951-6-30

Media Info

• Features: Figures; Tables;
• Pagination: 13 p.

Subject/Index Terms

• TRT Terms: Acceleration (Mechanics); Bearings; Freight cars; Journal boxes; Motor vehicle bodies; Railroad cars; Ride quality; Snubbers; Spring; Stresses; Suspensions; Technology; Trucks; Vehicle design; Vehicle dynamics
• Uncontrolled Terms: Lateral dynamics
• Geographic Terms: United States
• Old TRIS Terms: Car body
• Subject Areas: Design; Motor Carriers; Railroads;

Filing Info

• Accession Number: 00040244
• Record Type: Publication
• Report/Paper Numbers: AAR MR-114
• Files: TRIS
• Created Date: Jul 8 1994 12:00AM